67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
/*
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Copyright (c) 2014, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "test.hpp"
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#include "setup_transfer.hpp"
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#include "libtorrent/random.hpp"
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#include <array>
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using namespace lt;
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TORRENT_TEST(random)
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{
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const int repetitions = 200000;
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for (int byte = 0; byte < 4; ++byte)
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{
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std::array<int, 256> buckets;
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buckets.fill(0);
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for (int i = 0; i < repetitions; ++i)
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{
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std::uint32_t val = lt::random(0xffffffff);
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val >>= byte * 8;
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++buckets[val & 0xff];
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}
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for (int i = 0; i < 256; ++i)
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{
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const int expected = repetitions / 256;
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// expect each bucket to be within 15% of the expected value
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std::printf("%d: %f\n", i, double(buckets[i] - expected) * 100.0 / expected);
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TEST_CHECK(std::abs(buckets[i] - expected) < expected / 6);
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}
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}
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}
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